21727201 has 8 divisors (see below), whose sum is σ = 21982464. Its totient is φ = 21473760.

The previous prime is 21727193. The next prime is 21727213. The reversal of 21727201 is 10272712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21727201 - 2³ = 21727193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21727231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46696 + ... + 47158.

It is an arithmetic number, because the mean of its divisors is an integer number (2747808).

Almost surely, 2^21727201 is an apocalyptic number.

It is an amenable number.

21727201 is a deficient number, since it is larger than the sum of its proper divisors (255263).

21727201 is a wasteful number, since it uses less digits than its factorization.

21727201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 21727201 is about 4661.2445762908. The cubic root of 21727201 is about 279.0409407082.

Adding to 21727201 its reverse (10272712), we get a palindrome (31999913).

The spelling of 21727201 in words is "twenty-one million, seven hundred twenty-seven thousand, two hundred one".